When you change. Bill described your transformation, and it doesn't sound like our usual regeneratuion." He leaned into Missy's hand, closing his eyes at the pleasant sensation. "Alright. I'll try. But you promise me, if you're still rattling around in his consciousness somewhere, after you've gone, then tell him that it's got to be a two-way street. I know he's been doing better since he came, but I'm not going to let him walk all over me."